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Moving average
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Exponential smoothing
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How to choose
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Tips and tricks
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Here’s what else to consider
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If you are involved in inventory management, you know how important it is to forecast the demand for your products accurately. Demand forecasting helps you plan your production, purchasing, and distribution activities, and avoid overstocking or understocking your inventory. Two common methods of demand forecasting are moving average and exponential smoothing. But what is the difference between them, and how do you choose the best one for your situation?
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1 Moving average
Moving average is a simple method that calculates the average demand for a certain period of time, based on the historical data of previous periods. For example, if you want to forecast the demand for the next month, you can use the average demand of the last three months as your estimate. The advantage of moving average is that it is easy to understand and apply, and it smooths out the random fluctuations in the demand data. The disadvantage is that it gives equal weight to all the past periods, regardless of how recent or relevant they are, and it does not capture the trends or seasonality in the demand pattern.
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2 Exponential smoothing
Exponential smoothing is a more sophisticated method that assigns more weight to the most recent data, and less weight to the older data, using a smoothing factor called alpha. Alpha is a number between 0 and 1 that determines how much weight is given to the latest observation. For example, if alpha is 0.2, then the forecast for the next period is 20% of the current demand plus 80% of the previous forecast. The advantage of exponential smoothing is that it adapts more quickly to the changes in the demand level, and it can handle trends and seasonality by using different variations of the method. The disadvantage is that it requires more data and calculations, and it may be more sensitive to outliers or errors in the data.
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3 How to choose
When it comes to demand forecasting, there is no one-size-fits-all solution. It all depends on the nature of your product, the availability and quality of your data, and the accuracy and complexity you need. Generally speaking, if your demand is stable and does not show any significant trend or seasonality, then a moving average method is best. However, if your demand is dynamic and shows some trend or seasonality, then exponential smoothing is more suitable. To determine which method works best for you, compare their performance by using historical data and measuring the forecast error (such as mean absolute deviation or mean squared error). This will help you select the one that minimizes the error.
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4 Tips and tricks
No matter which method you choose for demand forecasting, it’s important to use a combination of quantitative and qualitative methods, such as market research, customer feedback, and expert opinion. You should also review and update your forecasts regularly to identify any gaps or deviations and make corrections. Additionally, it’s essential to communicate your forecasts clearly and in a timely manner to stakeholders like suppliers, manufacturers, and distributors in order to ensure alignment and coordination of inventory activities.
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5 Here’s what else to consider
This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?
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